190181421 has 6 divisors (see below), whose sum is σ = 274706510. Its totient is φ = 126787608.

The previous prime is 190181413. The next prime is 190181429. The reversal of 190181421 is 124181091.

It is an interprime number because it is at equal distance from previous prime (190181413) and next prime (190181429).

It can be written as a sum of positive squares in only one way, i.e., 101727396 + 88454025 = 10086^2 + 9405^2 .

It is not a de Polignac number, because 190181421 - 2³ = 190181413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190181429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10565626 + ... + 10565643.

Almost surely, 2^190181421 is an apocalyptic number.

It is an amenable number.

190181421 is a deficient number, since it is larger than the sum of its proper divisors (84525089).

190181421 is a wasteful number, since it uses less digits than its factorization.

190181421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21131275 (or 21131272 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 190181421 is about 13790.6280132560. The cubic root of 190181421 is about 575.0726269951.

The spelling of 190181421 in words is "one hundred ninety million, one hundred eighty-one thousand, four hundred twenty-one".